find lines in another file based on contents in a second file

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# 1  
Old 11-17-2011
Question find lines in another file based on contents in a second file


I have a file with tab delimited columns like:

A    2    C    R
F    4    D    Q
C    9    A    B

I want to grep out the lines in a second file, File2, corresponding to each line in File1

Can I do this:

while read a b c d
grep '$a\t$b\t$c\t$d' File2 >> Results
done < File1

Or is there a more efficient way to achieve the same results?

Thanks for your input!
Moderator's Comments:
Mod Comment
Please use code tags when posting data and code samples!

Last edited by vgersh99; 11-17-2011 at 08:02 PM.. Reason: code tags, please!
# 2  
Old 11-17-2011
grep -f file1 file2
# OR (depending on the actual content of your file1)
fgrep -f file1 file2

# 3  
Old 11-17-2011
Hi vgersh99,

Thanks for your reply. The code works, however, since I have several thousand rows in both file1 as well as file2, this will take a long time.

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